摘要
利用遥感资料和地理信息技术,准确界定了岷江上游干旱河谷的范围,分析了岷江上游干旱河谷面积的变化及其与局地环境的关系、聚落与非聚落区干旱河谷边界位移的差异.研究表明:岷江上游干旱河谷主要位于海拔1 501~3 000 m的15°~45°阳坡地带;随着退耕还林等生态工程的实施,1999-2009年干旱河谷的面积减少了157.48 km^2;受人类活动的影响,聚落和非聚落区的干旱河谷边界在垂直方向均有所下降,且存在显著差异:聚落区、非聚落区干旱河谷边界分别下降61.15、48.20 m.研究结果可为岷江上游干旱河谷植被恢复、资源合理利用和生态建设提供重要的科学参考.
Based on remote sensing data and the geographic information system, the distribution of dry valleys in the upper reaches of the Mingjiang River was quantified. The changes in the area of dry valleys and their relationship with the local environment, and the differences of boundary displacements between settlement and non-settlement areas were analyzed, with the results： The main distribution area of dry valleys were located on sunny slopes where the altitudes are between 1 501 m and 3 000 m and the slopes are between 15° and 45°. With the implementation of ecological projects, such as green instead of grain, the dry areas decreased by 157.48 km2 from 1999 to 2009. Affected by human＇s activities, the vertical displacements of dry valleys decreased, both in settlement and non-settlement regions, but the decreases were distinctly different, with the settlement region being decreased by 61.15 m and the non-settlement region by 48.20 m. The study can provide references for vegetation restoration, rational use of resources and ecological development in the dry valleys of the upper reaches of the Minjiang River.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2017年第3期316-321,共6页
Journal of Lanzhou University(Natural Sciences)
基金
科技部"十二五"国家科技支撑计划课题(2015BAC05B04-01)
国家自然科学基金项目(41071115)
四川省科技厅项目(2012SZ0175
2013SZ0101
2014SZ0063
2014SZ0058)
关键词
干旱河谷
边界位移
空间分布
岷江上游
dry valley
boundary displacement
spatial distribution
the upper reaches of the Minjiang River
